package service;

import mapper.UserMapper;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import pojo.User;
import utils.SqlSessionFactoryUtils;

public class UserService {
    //使用工具类获取SqlSessionFactory
    SqlSessionFactory factory = SqlSessionFactoryUtils.getSqlSessionFactory();
    /**
     * 登录方法
     */
    public User login(String username, String password){
//1. 获取SqlSession
        SqlSession sqlSession = factory.openSession();
//2. 获取UserMapper
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
//3. 调用方法
        User user = mapper.selectByUsername(username);
//4. 释放资源
        sqlSession.close();
//5. 验证密码
        if(user != null){
            if(!user.getPassword().equals(password)){
//密码不符
                return null;
            }else{
                //验证通过
                return user;
            }
        }
        return null;
    }
    /**
     * 注册用户
     */
    public boolean register(String username, String password) {

        SqlSession sqlSession = factory.openSession();
        UserMapper userMapper = sqlSession.getMapper(UserMapper.class);

        User user = userMapper.selectByUsername(username);
        if (user!=null){
            return false;
        }
        User newUser = new User(null,username,password);
        int i = userMapper.add(newUser);
        sqlSession.commit();
        sqlSession.close();
        return  i>0;
    }
    public boolean checkUsername(String username) {

        SqlSession sqlSession = factory.openSession();
        UserMapper userMapper = sqlSession.getMapper(UserMapper.class);

        User user = userMapper.selectByUsername(username);
        if (user!=null){
            return true;
        }

        sqlSession.close();
        return false;
    }
}
